Shane and Blane Are Identical (Monozygotic) Twins; However, People Seldom

question 235

Multiple Choice

Shane and Blane are identical (monozygotic) twins; however, people seldom get the two brothers mixed up because Blane is almost two inches shorter than Shane. The difference in height means that

• A) even though both brothers display the same phenotype, they have different genotypes.
• B) because the brothers display different phenotypes, they must also have different underlying genotypes.
• C) even though both brothers share the same genotype, they display different phenotypes.
• D) Blane is heterozygous for the "tallness" trait, and Shane is homozygous for the "tallness" trait.

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